搜题请搜索小程序“爱下问搜题”
问题 单项选择题 A1/A2型题

继发性甲状腺功能减退时，甲状腺激素的含量变化是 （）

A.T3，T4升高，TSH下降

B.T3，T4下降，TSH上升

C.T3，T4下降，TSH下降

D.T3，T4升高，TSH升高

E.T3，T4升高，TSH不变

答案

参考答案：C

解析：继发性甲减时，主要病变在垂体或下丘脑，因TSH分泌不足，可见T3，T4含量也下降。因此本题最佳选项是C。

阅读理解

Hello! I’m Sandy .I’m a Grade 8 students.I study at a secondy school .Now let me tell you about my school life. I get up at 6:15 a.m.Then I have my breakfast at six thirty. I go to school by bus .My home is about five kilometers away.from school.This often takes me 20 minutes.The first school begins at eight every morning.I usually have four classes in the morning and two in the afternoon.Each class lasts 45 minutes .I have lunch at school .I often eat rice ,meat and many vegetables.Then I can sleep about half an hour.After class, I play volleyball or football with my classmates.School is over and I go home.I spend an hour on my homework .I watch TV for half an hour .                                      

小题1:What time does Sandy get up every day ?

A．6:15 a.m

B．6:15 p. m

C．6:30 a. m

D．7 a.m小题2:How does Sandy go to school every morning?

A．On foot

B．on a bike

C．By car

D．By bus小题3:How far is her home from school?

A．5 meter.

B．5 kilometers.

C．15miles.

D．15kilometers小题4:.How long does it take her to take a bus every morning?

A．20minutes.

B．20seconds.

C．20hours.

D．20days.小题5:How many classes does she have in a day?

A．2

B．4

C．6

D．8
查看答案
单项选择题

煤的反应性是指( )。

A．将固体的煤最大限度地加工成气体燃料的过程
B．在一定温度条件下煤与不同气体介质发生化学反应的能力
C．煤中矿物质在高温燃烧或气化过程中，煤炭软化、熔融而结渣的性能
D．煤堆外力作用时的抵抗能力
查看答案